Replace/Filter dynamic values in attributes

Using v-for on inputs with labels generates can generate a random `for` and matching `id`. It would be cool if there was an option similar to the property matcher where you could define those.

Start by reading the serializer's existing property-matcher behavior and its unit tests, then trace how v-for-generated label for/id attributes are serialized. Define the expected option behavior for those dynamic values and verify it with snapshot coverage for matching label and id pairs.

Written by the indexing model from the issue text.